Problem

Dear Sirs,
I would like you to give us a hand to solve the following problem:
The problem is that when he makes a print out the ink powder on the paper is
easily erased by finger. It seems as if the ink was not melt or adhered
enough with the paper.
Please guide me how to solve this problem and the reason behind it to avoid
such malfunction in the future.
Awaiting your urgent reply as soon as possible.
Best regards,
Haytham